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प्रश्न
Describe the human alimentary canal.
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उत्तर
Human alimentary canal consists of:
- Mouth - It is the first organ in the sequence which helps in sucking, chewing, salivation and swallowing. The food is ingested through mouth,
- Pharynx - It is situated behind the soft palate and leads into oesophagus. It is divided into three parts - nasopharynx, oropharyx and laryngopharynx.
- Oesophagus - It lies upto the middle of the thorax, behind the trachea and the heart. It pushes the food down into the stomach by peristaltic movements,
- Stomach - It is the widest organ ofthe alimentary canal. It is J - shaped and is divided into three parts: cardiac, body and pyloric.
- Intestine - It is of two types: small intestine and large intestine. Small intestine is the longest part of the alimentary canal and comprises of three regions - duodenum, jejunum and ileum. It helps in the absorption of food, Large intestine is divisible into three parts - caecum, colon and rectum. It absorbs water from the food.
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संबंधित प्रश्न
What are the functions of liver and pancreas in the human digestive system ?
Pancreatic juice contains enzymes which digest:
(a) proteins and carbohydrates only
(b) proteins and fats only
(c) fats and carbohydrates only
(d) proteins, fats and carbohydrates
Which part of alimentary canal receives bile from the liver?
(a) oesophagus
(b) small intestine
(c) stomach
(d) large intestine
Where does digestion of fat take place in our body?
Mention two ways in which the ileum of the mammal is adapted for the absorption of digested food.
How is the liver an important organ in our body?
Study the diagram given below and then answer the question that follows:
Identify the tooth and give a reason to support your answer.
Complete the following table by filling in the blanks 1 to 8.
|
Organ |
Enzyme |
Food acted upon |
Find product |
|
1 |
Pepsin |
2 |
3 |
| Mouth | 4 | 5 | Disaccharide |
|
6 |
7 |
Maltose |
8 |
Study the following dental formula and then answer the question that follow:
`"i" 3/4 "c" 0/0 "pm" 0/1 "m" 1/1`
Name an animal possessing such a dentition.
Fill in the blanks.
Grinding of food is brought about by _______ and ______
Give reasons for the following:
All teeth in the mouth are not alike.
State whether the following statements are True or false: Trypsin coagulates the milk protein.
Correct the spellings: Disegion
The question has four options. Choose the correct answer:
Uvula can close the opening of
Which systems work together to provide the body with energy?
State whether true or false. If false, correct the statement.
During digestion, proteins are broken down into amino acids.
Identify the salivary gland lying below the tongue.
Select the correct pair of peptide hormones secreted by the alimentary canal.
The contraction and expansion movement of the walls of the food pipe is called ____________.
Fill in the blanks using the words listed below.
| water, front, intestinal, salts, pseudopodia, back, vacuole |
- The digestion of all food components is completed by the ______ juice.
- Large intestine absorbs ______ and some ______ from the undigested food.
- Tongue is attached at the ______ to the floor of the mouth cavity and is free at the ______.
- Amoeba pushes out ______ around the food and traps it in a food ______.
